Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"circulator"”.
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An accurate junction circulator design procedure
A novel circulator design method is presented. It utilizes H. Bosma’s suggested electrical model, a program written for a digital computer representing this model, Fay & Comstock’s design method to calculate electrical and physical properties of applied ferrite cylindrical resonators and measured …
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Investigation of Ultra-Low Power CMOS GHz Circulator
… the circuitry and the qubits and improve speed. Circulators are one of the most common blocks in qubit readout circuits, but most cryogenic circulators today are bulky. This project investigated the design of scalable cryo-CMOS circulators. To reduce power consumption below the cooling budget in …
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Circulator Shuttle Implementation Plan for the City of Pittsburg, California
… can meet transportation needs in Pittsburg. A circulator shuttle connecting major commercial nodes, public facilities, and residential locations, can increase travel options and improve accessibility to key locations. A review of best practices and transit planning standards provides a means to …
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Effects of a surface circulator on temperature, dissolved oxygen, water velocity, and photosynthetic yield in Falling Creek Reservoir
… Water Authority installed a solar-powered circulator in Falling Creek Reservoir, located in Bedford County, Virginia, in an attempt to limit the growth of these organisms through limiting light exposure by circulating them deeper within the reservoir. Experiments were performed during the …
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Simulation of a vertical ground-coupled heat pump system with optimal ground loop design
… of a water-to-air or water-to-water heat pump, a circulator pump, a buried pipe grid and an interconnecting header. Heat is extracted from or rejected to the ground through this buried pipe grid that circulates a heat transfer fluid such as water or a water/antifreeze solution. Energy is spent to …
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Nonreciprocal microwave devices using parametric frequency conversion
… The gyrator is then used to construct a circulator, and its performance's dependence on the same nonidealities is evaluated. A simulated design example is used to demonstrate a practical realization of such a circulator.
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Machine learning techniques for the health monitoring of rotating machinery in nuclear power plants
… predictive measures of asset health for AGR gas circulator units. Both of these topics are unified in their engineering context, and the overall aim of the approaches employed: to provide improved decision support using data to reliability staff tasked with monitoring key nuclear assets. A …
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Analogue self-interference cancellation in full-duplex radios
… RF circuit is implemented together with an RF circulator. The circulator isolates the transmitter chain from the receiver chain. The proposed design aims to reduce the form factor and complexity of the canceller. The canceller is modelled and simulated in MATLAB/Simulink. The results show that …
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Analogue self-interference cancellation in full-duplex radios
… RF circuit is implemented together with an RF circulator. The circulator isolates the transmitter chain from the receiver chain. The proposed design aims to reduce the form factor and complexity of the canceller. The canceller is modelled and simulated in MATLAB/Simulink. The results show that …
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Finite difference time domain analysis of microstrip antenna-circuit modules
… transmit-receive operation integrating an active circulator (using amplifiers in a ring-like arrangement) and a quarter wavelength antenna was analysed. Coupling effects were identified and their impact on the radiation patterns was shown. Electronically tuneable microstrip patch antennas using …
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Continuous production of conducting polymer
… peltier thermoelectric coolers and refrigerated-circulator held the deposition chamber at -10⁰C. The polypyrrole film deposited onto the surface of a rotating glassy carbon crucible was peeled off using a blade and spring force mechanism. The temperature, current, and voltage of the …
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Resonator sensors integrated in bandpass filters for the detection and attenuation of interfering signals
… The wideband sensor design is tested with a circulator to demonstrate the proposed tunable attenuator design.
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Optical fiber temperature sensor based on fiber bragg grating
… sensors is the fiber Bragg grating, with optical circulator, ASE source and OSA, the FBG which reflects a wavelength of light that shifts in response to variations in temperature. The advantage of reflection that its can easily detect the Bragg reflected signal. The FBG is very sensitive to …
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The design and control of a thermal management system for a photovoltaic reverse osmosis system
… uses a solar panel-mounted heat exchanger, circulator pump and servo valves to maximize water production while operating within the temperature limits of both the solar panel and the reverse osmosis membrane. Preliminary controller simulations show that it can successfully manage the …
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New Techniques for Time-Reversal-Based Ultra-wideband Microwave Pulse Compression in Reverberant Cavities
… only one feed connected to an ultra-wideband circulator (6.5 GHz to 17 GHz) to perform TRPC. Prior to this work, TRPC has only been demonstrated in electromagnetics using two or more feeds and a reverberant cavity acting as the time-reversal mirror. This new 1-port technique is demonstrated in …
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Adaptive Duplexer for Software Radio
… prototype of the adaptive duplexer using a 20dB circulator and a single loop cancelling technique was designed and implemented. It achieved a total Tx leakage cancellation of 69dB at 2GHz with 45MHz duplexing frequency. However it was not possible to simultaneously cancel the transmitter noise in …
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Thermal inactivation of Salmonella and Escherichia coli O157:H7 in heat treated, recycled used cooking oil
… 62, 71, or 82°C using a water bath fitted with a circulator. At predetermined time intervals, individual samples were removed from water bath and immediately chilled in an ice bath. Samples were diluted in 0.1% buffered peptone water supplemented with 1% emulsifier (Tween 80). Samples were plated …
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Impact of mixed solvent on co-crystal solubility, ternary diagrams and crystallisation scale-up. Crystallisations of Isonicotinamide ¿Benzoic Acid Co-crystals from Ethanol ¿Water Co-solvent System.
… - 90 % ethanol) by utilising the Cryo-Compact circulator. Co-crystals (1:1) and (2:1) were grown in ethanol and water respectively and a mixture of both phases were grown in the mixed solvent. All the phases were examined by powder X-ray diffraction (PXRD), Raman, Infrared and 1H-NMR …
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A Novel Long-Range Passive UHF RFID System over Twisted-pair Cable
… system are simultaneous, finite isolation of the circulator/directional coupler and environmentally dependent reflection ratio of the antenna lead to serious leakage problems. Leakage can directly cause sensitivity degradation due to saturation of the RF components. A fast leakage suppression …
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Magnetless circulators based on linear time-varying circuits
… lack of high performance low-cost and small-size circulators that could mitigate the strong self-interference at the RF frontend interface of full-duplex transceivers while, at the same time, permitting low-loss bi-directional communication using a single antenna. Traditionally, such …
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